Mitsubishi Outlander XL. Manual — part 248

DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

M11310100184USA0000010000

ZK602836

1 2

1 2

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

YELLO

W

-GREEN

YELLO

W

-BLUE

ENGINE
CONTROL
MODULE

ENGINE COOLANT
TEMPERATURE SENSOR

B-09

(MU802406)

B-10

ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT

2

27

1

26

AA00

5V

ZK603598

Engine coolant
temperature sensor

AA00

Exhaust gas
recirculation valve

B-09 (B)

Connector: B-09

ZK603591

ECM

B-10 (GR)

Connector: B-10

AA00

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-187

DIAGNOSTIC TROUBLE CODE PROCEDURES

CIRCUIT OPERATION

｠

5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal No. 1)
from the ECM (terminal No. 26) via the resistor in
the ECM. The ground terminal (terminal No. 2) is
grounded with ECM (terminal No. 27).

｠

The engine coolant temperature sensor is a
negative temperature coefficient type of resistor. It
has the characteristic that when the engine coolant
temperature rises the resistance decreases.

｠

The engine coolant temperature sensor output
voltage increases when the resistance increases
and decreases when the resistance decreases.

TECHNICAL DESCRIPTION

｠

The engine coolant temperature sensor converts
the engine coolant temperature to a voltage and
outputs it.

｠

The ECM checks whether this voltage is within a
specified range.

DESCRIPTIONS OF MONITOR METHODS

｠

Engine coolant temperature sensor output voltage
drops from over 40°C (104°F) to under 40°C (104°
F) and keeps under 40°C (104°F) for 5 minutes.

｠

Engine coolant temperature sensor output voltage
does not reach close loop enable temperature
within specified period when engine coolant
temperature sensor output voltage at engine start is
under 7°C (45°F).

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored in
memory for the item monitored below)

｠

Not applicable

Sensor (The sensor below is determined to be
normal)

｠

Engine coolant temperature sensor

｠

Intake air temperature sensor

13Ab-188

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS <Range/Performance problem - low input (time to reach closed loop
temperature)>

Logic Flow Chart

Start

End

Yes

No

No

Yes

Malfunction

Good

Time has passed

After starting?

Engine

coolant

temp.

Closed loop

enable temp.

>

Monitoring

conditions?

No

Yes

ZK603704 AA00

Check Conditions, Judgement Criteria

｠

About 60 - 300 seconds have passed for the engine
coolant temperature to rise to about 7°C (44.6°F)
after starting sequence was completed.

｠

However, time is not counted when fuel is shut off.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-189

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS <Range/Performance problem - drift>

Logic Flow Chart

Start

End

No

No

Yes

Yes

Malfunction

Good

Under 40degC

300secs have passed?

No

Yes

Over 40degC

Yes

Over 40degC

No

ZK603705 AA00

Check Conditions, Judgement Criteria

｠

Engine coolant temperature decreases from higher
than 40°C (104°F) to lower than 40°C (104°F).

｠

Then the engine coolant temperature has continued
to be 40°C (104°F) or lower for 5 minutes.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 9 P.13Ab-8.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

｠

Engine coolant temperature sensor failed.

｠

Harness damage

｠

Connector damage

｠

ECM failed.

13Ab-190

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES